The Tokyo Electric Power Co. has identified a crack in the maintenance pit of the damaged Fukushima Daiichi nuclear reactor in Japan as the source of the leak releasing contaminated water. Attempts to seal the crack with concrete, sawdust, special polymers and even shredded newspaper did not work. The company, which now says it needs to release radioactive water into the ocean to keep things stable, says it will try to construct a silt barrier to stop the leak.

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